Parallel battery module

Abstract

The present disclosure provides a parallel battery module comprising a plurality of battery cells, a first current collection connector, and a second current collection connector. The plurality of battery cells are in parallel connection. Each battery cell comprises a conducting top cover plate, a first terminal, a conducting connector, a second terminal, a bare cell, a fuse, and a conducting deformable piece. The first current collection connector and the second current collection connector are disposed on the top of the plurality of battery cells, and are electrically connected to the first terminal and the second terminal of the plurality of battery cells, respectively. When the conducting deformable piece of a battery cell deforms and becomes electrically connected to the conducting connector, the electrical connection between said battery cell and other battery cells is broken by blowing the first current collection connector and/or the second current collection connector.

What is claimed is: 
     
       1. A parallel battery module, comprising:
 a plurality of battery cells in parallel connection, each battery cell comprising:
 a conducting top cover plate; 
 a first terminal that is assembled to be insulated from the conducting top cover plate; 
 a conducting connector that is electrically connected to the first terminal and insulated from the conducting top cover plate; 
 a second terminal that has an opposite polarity to the first terminal and is assembled to be electrically connected to the conducting top cover plate; 
 a bare cell that is electrically connected to the first terminal and the second terminal; 
 a fuse that is connected between the first terminal and the bare cell or connected between the second terminal and the bare cell; and 
 a conducting deformable piece that is electrically connected to the conducting top cover plate and is disposed below the conducting connector, wherein the conducting deformable piece deforms and becomes electrically connected to the conducting connector such that the first terminal and the second terminal are electrically connected to form an external short circuit when an internal gas pressure of a battery cell reaches a certain level; 
 
 a first current collection connector disposed on top of said plurality of battery cells and is electrically connected to the first terminals of said plurality of battery cells, wherein the first current collection connector comprises:
 a plurality of first connection parts, a total number of the plurality of first connection parts being the same as a total number of the plurality of battery cells, each first connection part being electrically connected to the first terminal of a corresponding battery cell; 
 a first current collection part; and 
 one or more first fusing parts connected between the first current collection part and a corresponding first connection part for each of the plurality of first connection parts; and 
 
 a second current collection connector disposed on the top of said plurality of battery cells and is electrically connected to the second terminals of said plurality of battery cells, 
 wherein, when the conducting deformable piece of the battery cell deforms and is electrically connected to the conducting connector, an electrical connection between said battery cell and other battery cells of the plurality of battery cells is broken by blowing the one or more first fusing parts corresponding to said battery cell of the first current collection connector to electrically isolate said battery cell from the other battery cells. 
 
     
     
       2. The parallel battery module of  claim 1  wherein, for one battery cell, a total overcurrent cross sectional area of the one or more first fusing parts connected between one first connection part and the first current collection part is smaller than one half of a contact area between the conducting deformable piece and the conducting connector of said battery cell after the conducting deformable piece deforms to be in contact with the conducting connector. 
     
     
       3. The parallel battery module of  claim 1 , wherein each of the one or more first fusing parts is rectangular or S-shaped. 
     
     
       4. A parallel battery module, comprising:
 a plurality of battery cells in parallel connection, each battery cell comprising:
 a conducting top cover plate; 
 a first terminal that is assembled to be insulated from the conducting top cover plate; 
 a conducting connector that is electrically connected to the first terminal and insulated from the conducting top cover plate; 
 a second terminal that has an opposite polarity to the first terminal and is assembled to be electrically connected to the conducting top cover plate; 
 a bare cell that is electrically connected to the first terminal and the second terminal; 
 a fuse that is connected between the first terminal and the bare cell or connected between the second terminal and the bare cell; and 
 a conducting deformable piece that is electrically connected to the conducting top cover plate and is disposed below the conducting connector, wherein the conducting deformable piece deforms and becomes electrically connected to the conducting connector such that the first terminal and the second terminal are electrically connected to form an external short circuit when an internal gas pressure of a battery cell reaches a certain level; 
 
 a first current collection connector disposed on top of said plurality of battery cells and is electrically connected to the first terminals of said plurality of battery cells; and 
 a second current collection connector disposed on the top of said plurality of battery cells and is electrically connected to the second terminals of said plurality of battery cells, 
 wherein the second current collection connector comprises:
 a plurality of second connection parts, a total number of the plurality of second connection parts being the same as a total number of the plurality of battery cells, each second connection part being electrically connected to the second terminal of a corresponding battery cell; 
 a second current collection part; and 
 one or more second fusing parts connected between the second current collection part and a corresponding second connection part for each of the plurality of second connection parts, 
 
 wherein, when the conducting deformable piece of the battery cell deforms and becomes electrically connected to the conducting connector, the electrical connection between said battery cell and the other battery cells is broken by blowing the one or more second fusing parts of the second current collection connector corresponding to said battery cell. 
 
     
     
       5. The parallel battery module of  claim 4 , wherein, for one battery cell, a total overcurrent cross sectional area of the one or more second fusing parts connected between one second connection part and the second current collection part is smaller than one half of a contact area between the conducting deformable piece and the conducting connector of said battery cell after the conducting deformable piece deforms to be in contact with the conducting connector. 
     
     
       6. The parallel battery module of  claim 4 , wherein each of the one or more second fusing parts is rectangular or S-shaped. 
     
     
       7. A parallel battery module, comprising:
 a plurality of battery cells in parallel connection, each battery cell comprising:
 a conducting top cover plate; 
 a first terminal that is assembled to be insulated from the conducting top cover plate; 
 a conducting connector that is electrically connected to the first terminal and insulated from the conducting top cover plate; 
 a second terminal that has an opposite polarity to the first terminal and is assembled to be electrically connected to the conducting top cover plate; 
 a bare cell that is electrically connected to the first terminal and the second terminal; 
 a fuse that is connected between the first terminal and the bare cell or connected between the second terminal and the bare cell; and 
 a conducting deformable piece that is electrically connected to the conducting top cover plate and is disposed below the conducting connector, wherein the conducting deformable piece deforms and becomes electrically connected to the conducting connector such that the first terminal and the second terminal are electrically connected to form an external short circuit when an internal gas pressure of a battery cell reaches a certain level; 
 
 a first current collection connector disposed on top of said plurality of battery cells and is electrically connected to the first terminals of said plurality of battery cells; and 
 a second current collection connector disposed on the top of said plurality of battery cells and is electrically connected to the second terminals of said plurality of battery cells, 
 wherein: 
 the first current collection connector comprises:
 a plurality of first connection parts, a total number of the plurality of first connection parts being the same as a total number of the plurality of battery cells, each first connection part configured for electrical connection with the first terminal of a corresponding battery cell; 
 a first current collection part; and 
 one or more first fusing parts configured for connecting the first current collection part and a corresponding first connection part for each of the plurality of first connection parts; 
 
 the second current collection connector comprises:
 a plurality of second connection parts, a total number of the plurality of second connection parts being the same as a total number of the plurality of battery cells, each second connection part configured for electrical connection with the second terminals of a corresponding battery cell; 
 a second current collection part; and 
 one or more second fusing parts configured for connecting the second current collection part and a corresponding second connection part for each of the plurality of second connection parts; and 
 
 when the conducting deformable piece of the battery cell deforms and becomes electrically connected to the conducting connector, the electrical connection between said battery cell and the other battery cells is broken by blowing at least one of the one or more first fusing parts of the first current collection connector corresponding to said battery cell or the one or more second fusing parts of the second current collection connector corresponding to said battery cell. 
 
     
     
       8. The parallel battery module of  claim 7 , wherein, for one battery cell, a total overcurrent cross sectional area of the one or more first fusing parts connected between one first connection part and the first current collection part is smaller than one half of a contact area between the conducting deformable piece and the conducting connector of said battery cell after the conducting deformable piece deforms to be in contact with the conducting connector. 
     
     
       9. The parallel battery module of  claim 7 , wherein each of the one or more first fusing parts is rectangular or S-shaped. 
     
     
       10. The parallel battery module of  claim 7 , wherein, for one battery cell, a total overcurrent cross sectional area of the one or more second fusing parts connected between one second connection part and the second current collection part is smaller than one half of a contact area between the conducting deformable piece and the conducting connector of said battery cell after the conducting deformable piece deforms to be in contact with the conducting connector. 
     
     
       11. The parallel battery module of  claim 7 , wherein each of the one or more second fusing parts is rectangular or S-shaped.